Substation circuit



Patented Sept. 22, 1925.

f SIA PATENT .or-Fics.

-I4IA-RRY-II-.:IDE, 'on LAGRANGE, ILLINOIS, AssIGNcR -To-KnLLeGG swI-TcIIBoAnn AND SUPPLY COMPANY, or CHICAGO, ILLINOIS, AcoRPoRArIoN- or ILLINOIS.

sUnsTArIoiN cInCUIT.

Application ledMay .2, 1.9.23: Serial Ifo- 635ML To all whom t may concern.

Be tknown 'that L .HARRY H. IEDE, 2i Citinen` @it the United States' 0f. America, residing `in LaGrange., County i 000k, endgftete O QI/lljinois, here. invented certain new and useful vlnfipnovernents in lSubstntion Circuits,

' .oi which the following is a speciflcntigon.

i`or registering device of my invention is provided at each ASubscribers substation und is so arranged .thait when )the subscriber Vinitintes a` call, the meter .device will operate to register the call and `will lock' up and remain ill its; Alocked position until the celled subscriber removes A.his receiver whereupon my meter device is released from its locked position and 4restored to normal where it remains in readiness to register the next call initiated by Athis,calling subscriber. In, case the celled for subscriber does not answer or for some reason the 1ceiling; subscriber re- ;pluces'liis receiver `before thecalled for sublscriber answers, the meter ydevice of my invention will not be released to permit to restore to normal but will remain ini its A,locked position, ,S0 that when the said sub.- scriber signin removes his receiver, the register meter will not operate `to register an- -ctherca'll but: will only be released and re.- Lstcred when the calling subscribers line has been connected to n A.celled subscribers line andy the `called subscriber has removed his )receiver from vits switch-hook. n

, Another feature of my invention liesin the simple .andeconomicnl manner in which my. meter or registering device is .constructed, and operated, anda-lso the manner in which the various part-s `are assembled, so es to permit the vsaine to be mounted-es a. single unit.

'lille' foregoing features es well as. others wlillrble more' clearly pointed out in the :ensuing specification, 'reference 'being had to the. ecem'penyingr drawings, in which like A service meter reference characters in the several yiews `denote. like parts., and in which l `Fig. 1 is n. side efleyntion ofthe register mechanism of my invention with'the. cover of they enclosing casing removed.

Fig 12., iS. a right; @11d View of Fsl; .Fig- .3, S- a. Sectional View elsing the v1in@ ,591-3 of Jg.` .1, and Showing the epiveratus i511 its ncrniul .unlocked pcsition; i

Figi@ 4sectional view along tlieline lrfl of Fig. A1. V A' Fig. 5;, iszi` view Showing the registering mechanism of my invention in its ylocked 4posi-tion, and the ineens for controlling and locking the seme; n e' Fig@ is. `aJ View showing certain parts. of the locking mea-.lis for locking the l'resiste/1- ingV mechanism in itscperated position; and Fig. v7, its e schematic View of the circuit `zurrangei-nent of 4the sulgistation with which .Illy invention may be used, Referring now in general Ito my invention,

`PR is a polarized reley,.-whicl1 may be of any well lnown type, sind isaedzipted to operate when 5thecelled subscriber removes his receiver Vfrom ity SWitCll-hool A relay v yis proyided and is controlled by .thelcalled subscriber to reverse the How .of current through the talking- Y,conductors of en auto.-

inatic or -nianual system, to .operate relay PR as fis ,well known ,in the art. R` is. a service .or register meter for registering the nuinberofcalls .or connections completed by the calling subscriber, and which meter. R may be of ith@ well Yknown Veeder type.

A magnet, M is operatively Lassociated with the meterRibyvmeans of a ratchet and paw'l mechanism H. C is e condenser, which iney beofnny well known type, and -is provided for the usuel and wellknown purposes. Ais efteriminarl incl; to whiclilare sennired terminals for connecting external B 'being secured te the enclosingcesing D.l l e l-laying 4described myinvention 1n general, I vwill nowgg-Lve e detail description of rthe .same

The polarized relay PR comprises a pair of magnet coils 1, which are suitably secured to a member 2. A permanent U shaped magnet 3 is provided and has one of its legs suitably secured to the member 2, and its other leg extending at right angles to and in close proximity to the ends of t-he cores of the magnet coils 1. A yoke 4 is provided which is suitably secured to the cores of the magnet coils 1. An armature 5 is pivotally supported between a pair of ears 6 integrally formed with and intermediate the ends of the yoke 4, said armature being provided at its one end with an adjustable screw 7 for micrometrically adjusting the armature relative to the ends or' the cores of the magnet coils 1. The other end of the armature 5 has a fiexible member 8 secured thereto by means of a rivet 9 and whose purpose will be pointed out later. A bracket 10 having a pair of ears 11, is provided and suitably secured to the member 2, said ears 11 having suitable openings through which one end of a rod 12 extends and is suitably secured therein, said one end of rod. 12 being threaded. A member 13 having a suitable tapped oriiice is provided vand has screw-threaded engagement with the threaded end of rod 12. The rod 12 is permitted to be rotated in the orifices in the ears 11 of bracket 10 but so arranged that it will not .move in a longitudinal direction, and when the rod 12 is rotated, member 13 will move in a longitudinal direction, to increase or decrease the tension of the coil spring 14, which has its one end secured to a hook 15, which hook 15 is suitably secured tothe armature5, the other end of said spring 14 being arranged to .engage an opening in the free end of the member 13. The spring 14 retains the armature 5 in its normal position. The member 2 of relay PR is suitably secured 4to a member 16, but insulated and separated therefrom by a suitable insulation 17 and spacer washers 18, said member 16 being in turn secured to the mounting rack B by means of screws 20 and nuts 21. The rack B is secured to the en- `closing, casing D by means of screws 22 which pass through suitable openings in said rack B and have screw-threaded engagement with suitable tapped orifices in the said cover casing D. Members 23 are provided which are connected to the winding of the magnet coils 1 and extend through members 17 and 16 and rack B. A

The electro-magnet M of my invention for operating the meter or register device B comprises a magnet coil 24 secured between the legs of a U-shaped heel iron 25 by means of a screw-threaded extension 27 of the core 28 of said electromagnet 24, which extension `extends through suitable openings in the heel iron 25 and rack B where it has screw-threaded engagement with a nut p29,

whereby said magnet coil 24 and heel iron 25 are secured to the mounting rack B against displacement. Suitable terminals 30 are provided for the energizing winding of magnet coil 24 which extend through the heel iron 25 and rack B and are adapted to permit the winding of the magnet coil 24 to be connected to the external circuit with which it may be associated. A front plate 31 is provided which isl secured to the free ends of the heel iron 25, in a suitable manner, and which front plate 31 is provided with a pair of integrally formed ears 32 between which is pivotally mounted an armature 33 by means of suitable pivot screws 34, whereby the armature 33, is supported in operative position relative to the end ofthe core of the magnet coil 24. An angular member 35 is provided which is integrally formed with t-he front plate 31 and has its end 35 positioned in the path of travel of the armature 33, to limit the extent of the stroke of the said armature 33. The service or register meter R may be ot' the well known Veeder type and comprises the usual counting train which is actuated by means of a suitable ratchet and pawl mechanism H. The meter R is mounted on the plate 31, and to accomplish this, the casing which encloses the counter train is provided with a lug 36, integrally formed with the casing and which lug 36 extends through a suitable opening in the plate 31. A sleeve 37, having an opening for receiving the lug 36, is provided and is secured to the plate 31 in any suitable manner as by means of a staking operation. A set screw 38 having screw-threaded engagement with a suitable tapped orifice in the sleeve 37 holds the met-er R upon the plate 31, and a lock nut 39 holds the screw 38 in its position after it has been tightened. To prevent rotation of the meter R in the sleeve 37 after it is in place, the plate 31 is provided with lugs 40 integrally formed with the plate 31 by a shearing operation and which are so arranged so as to engage the extension 41 of the meter R in such a manner to prevent rotation of said meter B. A pawl 42 is provided which is pivotally secured `to the free end of the armature 33 by means of a suitable pivot screw 150 shown on the drawing and extends forward through a slot 43 in the plate 31 and cooperates with a ratchet 44 secured to the shaft 45 of the counter train of the meter R. The forward end of the pawl 42 is provided with a rectangular orifice in which a portion of the ratchet 44 rests so that the edge 46 of said orifice engages a tooth 47 of the ratchet 44. An angular member is provided and secured to the plate 31, said member 55 having a suitable slot through which said pawl 42 extends and serves as a guiding means `for said pawl 42. A coil spring 48 is provided for holding the .armature 33 S 11013193111 retracted position, its one end being secured to" aclip 49 `fastened4 to the plate 31 in a suitable2 manner, and the'other end of spring 48 isattached tovan `angular 'extension 50 integrally form-ed with the pawl 42'. The tension of the spring 48 is such as to exert an upward pull upon the pawl 42,' and this upward pull holds the'` pawl 42 Vin engagement with the ratchet 44... i The rearwardly eX- tending member y of the plate 10l serves as anadjustabl'e stop for the armature 33 when in its retracted position, and permits the properadjnstment of the strokeof the armature-33, that is the member 35, may be" bent inwardly te )permit a1 longer stroke or bent outwardly to shorten tlie'strole ofthe armature33. A set'of contact springs 50 and 5l* is provided and secured to the end of the coil 24 by means of' suitable screws. A buffer 5.2 of suitable insulation material is secured to the armature 33the said butter engaging the spring 51fto move it into engagement with the springOupon the attraction of the' armature 33, andv thel engagementof Contact springs and 5l, a shunting circu'it'- is closed: for the winding of magnet coil 24; A member 57 is 1provided which. has its ends turned overiat right anglesto-its main body' portion, and also has an ear 58'for a purpose toI be presently .pointedl out,'said member being of a 4sizev to span'the -coil 24 and' to have` its' turned over ends engage the legs' of the heel iron 25 and isl secured? in position by means of suitable 'screws 59 which extend through suitable openings in said ends and then have screwthreaded engagement with suitable tapped oriliees in the legs' of the heel iron 25. An angular member is provided and is pivotally mounted on the member 57 at 'the earv 58 lby means -of a. suitable pivotpiin 6l, which er;- tends through anopening in the said angular member 6()t and then has screwthreaded engagement with a suitabletapped orifice in the ear 58 of member 57. The downwardly exten-ding portion 262 of member 60' is adapted to engagethe upper edge portion 63 of the' armature 33 when the said armature is' in its attracted position and to hold or lock said varmature 33 vin its attracted yposition to prevent further actuation of theservice' `or register meter R, as will bemore clearly pointed out later.- The upwardly extending' portion 63 of angular 'member 60 is arraiiged so-that itsjcurved edge engages the member 8 secured to the end of armature 5. An adjustable member 65 is provided wliichf is secured to the portion 62' of member 60 by means of a screw 7 O which passes through a slot "66 in sai-d ymember l65 yand -then has screwthreaded engagement with va tapped loriice 67 in member 6).v rThe 'member 65 has its e'n-` flarg'ed end 67 turned over so that it is in alignment with zthe `upwardlyext'ending portion 63 of member 60, so that said turned over end 67 of member 65 will be iny operative engagement with the end of the member 8 secured to armature 5- for purposes to be moreV clearly hereinafter described; An ear 68 integrally formed with member 65 engages the face 7l of' member 60 to prevent rotation-of the adjustable member (55, and to cro-operate with the screw 7 O in maintaining said member 65 in its adjusted position on the member G0. The member G5 may be ladjusted relative to the member8, by loosening the screw 70 which will permit the member 65 to be moved in a vertical direction due to thev slot 66, and: when the proper adjust.- V,ment is made, screw 70 is again tightened` A con/denser C for overcoming sparking as is well known, is provided and secured to the rack B ly means of the screw-threaded member 73 and' nut 74e rlhe terminal rack A comprises an angular member 75 whichv is secured on the screws 2O and held thereon by nuts 7 6 which have' screw-threadedr engagement with'.V the said screws 20; I vTo themember 75 is secured astrip of insulation 77 by means of screws 78 which pass through openings in said strip of insulationl 77 and have screwthreaded engagement with suitable tapped oriiices in said member 75. Suitable terminals 79 are y'ar-ovided for receiving and connecting external conductors with the ter- Aengage this opening 80 and is Vtor the purpose of permitting the reading of said servrice meter R.v Another rectangular opening 80 is provided in the opposite end oit the casing D which is closed by means of a plate 81 which spans said opening 80 and is secured tothe casing DA by screws 82 which extend through openings in said plate 81 and then have screw-threaded engagement with suitable tapped orifices in the casing' D- The plate 81 is provided with an opening in which is suitably secured acylindrical member 83, through which said cylindrical member 83 external conductors are led 'to the terminal rack A. rEhe side 85 of the casing D is removably secured to the rest oft the casing D at its one end b-y means of a tongue member '86 which is secured to one` end of the side 85 by a 'rivet 87, the

'said tongue member 86 adapted to engage a slot 88 in the casing D, and said side 85 secured,V at itsnoth'er end by means of a locking member 89 which is secured to the side willengage the member'9l which lis suitably secured to the casing D. To remove the side 85, all that is necessary is to insert a suitable key into the lock 89 and operate the same to cause the bolt 90 to disengage the member 91 and then pull out and downwardly on the said side S5 whereupon the member 86 will disengage the slot 88.

For mounting purposes, I have so arranged the openings S0 and 80 that the apparatus of my invention secured to the rack B may be secured in the casing D as shown in Figs. 1 and 3, or reversed so that the service meter R will engage opening 80', instead oi opening 80, and when mounted in this position, the screws 22 will engage openings provided in the opposite end ot the casing D, and the plate 81 will span .and close the opening 80 instead of opening 80.

Having described the construction of my invention and the manner in which it is assembled, I will now describe the circuit arrangement wherein my invention is connected as illustrated in Fig. 7 and also the operation of my invention in registering a call or connection completely established by the calling subscriber.

In Fig. 7, I show a substation L which comprises a transmitter T, receiver S, receiver switch-hook 7L, calling device CD, call bell Z) and condenser c, and the polarized relay PR and electro-magnet M of my invention, the polarized relay PR of my invention is adapted to workin connection with a system wherein the battery flow is reversed upon the removal of the receiver from its switch-hook at the called for subscribers substation. When the receiver S is on its switch-hook h and the armature 33 of electromagnet -M is in its unlocked or normal position, the corner portion 95 of member 60, will rest upon the top edge 96 or' the armature 33 of electro-magnet M, and the member 8, secured to the armature 5 of relay PR will rest between the extension 63 of member 60 and the enlarged turned over end 67 of the adjustable member 65 as is clearly shown in Fig. 1. Then the receiver S at substation L is removed from its switch-hook, preparatory to establishinga call, a circuit is closed for the polarized relay PR traced from battery at the main exchange, conductor 100, alternate contact 101 of switch hook 71, closed impulse contact springs IS and normally closed off-normal contact springsv ON of the calling device CD, conductor 102, through the receiver S and transmitter T, winding ot the polarized relay PR, conductor 103 and back to the other side of battery at the main exchange. Polarized relay PR does not operate over this circuit to attract its armature against the tension ot spring 14, due to the tact that current is flowing through the winding of relay PR in such a way as to cause the relay to attract its armature in the same drection as the tension of spring 14 is exerting upon said armature.. Nothing more happens at this time. Now when the subscriber at L operates the calling device or impulse sending mechanism CD to transmit impulses of current to the main exchange, and upon the movement of said calling device oflnormal, the off-normal contacts ON assume their alternate position, whereby an energizing circuit is closed for the electromagnet M, which may be traced from battery at the main exchange, over conductor 100, alternate switch-hook contact 101, closed impulse springs IS, alternate contact ot oil-normal contacts ON, conductor 104, winding of said electro-magmet M, and conductor 103 to the other side ot battery at the main exchange. Electromagnet M energizes over this circuit and attract-s its armature 33 against the tensionoif spring 4S whereby contact spring 51 is caused to engage contact spring 50 to close a shunting circuit about the winding of said electromagnet M, and which is represented in Fig. 7 by front Contact 105, this shunting circuit for the winding` of electro-magnet M, is the same up to and including conductor 104 as just traced above and then through front contact 105 and armature 33 of said electromagnet, conductors 106 and 103 to battery. The attraction of armature 33 operates the pawl and ratchet mechanism H to operate the service or register meter R to register the call.

When the armature 33 is attracted, its top edge 96 will disengage the corner portion 95 of member 60, and said member 60 will, by gravity, move about its pivot pin 61 in a downward direction whereby the 'tace 10T of member 60 will engage the face 108 ot armature 33, and the end o't member 8 secured to the armature 5 oitI relay PR will engage the top face 109 of the member 65. Thus the armature 33 of electro-magnet vl will be locked in this position until the flow of battery is reversed through the polarized relay PR which will only be when the calling substation L is connected to another subscribers line and the subscriber thereon has removed his receiver from its switchhook. The subscriber at substation L having completed operating the calling device CD to transmit the required number ot impulses and assuming that the called for subscriber responds by removing his receiver from its switch-hook, a relay X will be operated at the main exchange to change the iow of battery through polarized relay PR in the well known manner. The reversal ot the flow of battery through relay PR will cause said relay PR to attract its armature in a direction opposite to the tension ot spring 14, whereby member 60 will move about its pivot 61 in an upward direction to free armature 33 of electro-magnet M,

fthe: fact that armature; of yeleotro-magnet dueto `the engagement A of member 8,1 se'- curedf toarmature 5, and thefaceftofthe extension 63 ofmember '60.2 rIlhe Jar-mature fbeing disengaged by member 60,- said armature. 33; will. be f ,restoredV to; :normal by thefspring 48 vvliereuponf thef paWlAQ, will engage. another tooth ofathe ratchet .441 to registerithegnext call` initiated by the sub-` scriber atsubstationh. VThen conversa-tion has terminated and the subscribers replace their receiversfupon theirl respectivef switchhooks, current will no ,longer fio'vvffthrough the relayJPR, andzsaid. relay*y Will cle-energize whereupon its armature-vill *bey restored to4 itsnormalposition bygthe coili spring 14g Y vandither. corner vportion 95, off` member. 60

i the: failure of :the current reversing lrel'ay X y Wllagain engageithetopifedge 964 of the armature 33, ,Whiletheatres/end oi. member Sewillrest betWeenthe endy of the; turned over end. .671 of member 65v and theiextension roffmember 60. 1 i g kAssuming-"now that thecalledV forxsub'- scriber did not respond sor thatfhis line-tested busy andthe calling YsubscriberA replaced `his receiverv S *upon itsV switch-hooks,V h, in this `caseythe flow of battery will not'be reversed through .;the=winding1 ot relay PR, due/rito at the main.y exchange f control: bythe :called fori subscriber to j0perate, whereupon relay PRvwillnot operate to:movewtheetmember fupward toicausefthe same-to disengage armature 33. of electro-magnet NEk Thus; `-it is at once obvious that the. armature f 33-A of electro-magnet MA will remain in4 its-rlocked position.- Now'shouldtliersubscriber'at sub station L. initiate another call A by removing his Freceiver from its switch-hook and operan ing, the calling device 'v CD, this Will have no i effectuponathe electro-magnet M dueto M. is initsr locked up rpositionfandlt-hef, shunt 'circuit'l remains established about .the electromagnet3M;` and+since:thesaidiarmature:33 isin itslocked position theiratchetan-dipawl mechanism/Hgvvjll notoperate to` advance the service meterR/anothernumberf Now .When kthe called for subscriberresponds; the currentviovviofjbattery will be reversed -to edect Qth'eoperation jof the polarized lrelay y.PR,vi/:herebythe armature 33 is .released fand permitted itorestore to normal as is :clearly .ture/,asicshown, but aim to cover all such meter, means associated with said actuating y meansand Vcontrolled b'y said meter magnet for locking,` said actuating means Vagainst actuatiomand ap'olarized relay operatively associated with said second meansfor actuating saidsecondmeans to free saidV actuating means.v c a 2. Ina device of the class described,- a register meter, actuating means for actuating saiidpreg-istermeter, a meter magnet forfs'aid register 4meter for `controlling Tand operating said f actuating means, locking meanspivotally supported onsaid meter magnet and controlled -by said-meter magnet for locking said actua-ting means again-st actuation, and a? polarized'relay 'operatively associatedivith said lockingmeansandadapted to'actuate said ,locking means to free: said actuating means 1- to permit the same'- to I restore to fnormah. L r i Y 3. A device of the characterdescribed -in'- cluding a register mechanism, actuating means for actuating said registermechanism, a metermagnet-for said register mechl anism forcontrolling saidfa'ct'uating means, lockingl means supported on said-meter magnet and controllediby saidmeter magnettor .lockingsaid actuation means against actua-4 tion, lWhensaid1register'mechanism has been advanced `one step, to prevent Afurther actua# tion` ofi said Lregister mechanism, and a relay operativelyAk associated Withy Vsaid locking means for operati-ng "the same Ato releaseE said actuating means 'to'fperinit further actuation ofsaid register'mechanism.A Y

t. Ina telephone systemg-acalling substation;v a lcallv registering device for regis# teringfthe number of 'calls `completed by ysaid calling substation, an electro-magnet Vfor ad# vancingy said registering device, locking means and controlll'edl by y'sai'delectromagnet for preventing further actuation oi said registering device, and -a polarized i relayiconJ trolled by ak called subscriber for 'actuating said locking meansftopermit further actuation of said cally registering device. i

5. In afl telephone 1system',f,aJv calling substa-thin,l acall registering meter for register# ing the'num-ber-o callscompleted by said substation; electromagnetic -means "controlled by saidI 'substation 'for advancing said regis#4 tering meter' a f single step, locking `means under'the; contr-ol of said -el'e'ctromagnetf for locking :said` registering 'devi-'ce' against 'l fuil ther advancement, and electromagnetic means controlled from a called substation :tor actuating said locking means to permit further advancement of said registering meter.

6. In a telephone system, a calling and called substation, a call registering device tor registering the number of calls completed from said calling substation, electromagnetic means controlled by said calling substation for actuatin said registering device to register a sing e call, means under the control of said electromagnet means for preventing further actuation of said registering device, and a polarized relay controlled trom the called substation for releasing said last means to permit said registering device to register another call when initiated from said calling substation.

7. In a telephone system, a calling substation, a service meter for registering the number of calls completed romsaid calling substation, actuating means for advancing said service meter a single step upon the initiation of a call from said substation, and locking means under the control of said electromagnet for preventing further advancement of said service meter until said calling substation has been connected to ann other subscribers line and the subscriber thereon responds by removing his receiver from its switchhook.

8. In a telephone system, a subscribers substation, a service meter for registering the number of calls completed from said subscribers substation, electromagnetic means for actuating said service meter when a call is initiated at said subscribers substation to register a single call, means for preventing further registration of said service meter regardless of the number of calls initiated at said subscribers substation prior to the connection of said subscribers substation with another subcribers line and the subscriber thereon responds, and electromagnetic means controlled by the tirst subscriber to respond to a connection extended from said subscribers substation for operating said second means to permit said service meter to register another call when another call is initiated at said subscribers substation.

9. In a telephone system, a calling substation and a called substation, a call registering device for registering the number of calls completed between said calling and called substations, a magnet controlled at said calling substation for actuating said device to register a single call at a time, means for preventing further actuation of said device by said magnet, and a relay controlled at said called substation for permitting `further actuation of said call registering device.

10. In a telephone system, a subscriber-s substation, a service meter for registering the number of calls completed from said subscribers substation with other subscribers substations, an impulse sending device, a magnet for actuating said service meter to register a single call at a time, and controlled by said impulse sending device, means for removing said magnet and the actuation of said service device from the control of said impulse sending device, a relay controlled from another subscribers substation for actuating said means to restore said magnet and service meter to the control of said impulse sending device.

11. In a device 01": the character described, a register mechanism and an electromagnet for operating the same, said registering mechanism being secured to said electromagnet, locking means primarily controlled by said electromagnet tor preventing the operation ot said service meter, a polarized relay for actuating said locking means to permit the operation of said service meter, a condenser associated with said electromagnet and polarized relay, a terminal rack for connecting external conductors with said electromagnet, said polarized relay, and said condenser, and a mounting rack to which is secured said electromagnet, polarized relay, terminal rack and condenser to form a single unit for mounting purposes.

12. In a device of the character described, a register mechanism, an electromagnet for operating the same, said registering mechanism secured to said electro-magnet, locking means primarily controlled by said electromagnet or preventing the operation of said register mechanism, a polarized relay for actuating said locking means to permit the operation of said register mechanism, a condenser associated With said electro-magnet and polarized relay, a terminal rack for connecting external conductors with said electromagnet, said polarized relay and said condenser, and a mounting raclcto which is secured said electro-magnet, polarized relay, terminal rack and condenserto form asingle unit, an enclosing case in Which said unit is mounted, said enclosing case having an opening in each end of a size to receive a portion of said register mechanism to permit the reading of said register mechanism, said mounting rack adapted to be secured in said enclosing case so that the register mechanism will engage the said opening in one end or to engage the said opening in the other end of said enclosing case, and a member provided with means through which external conductors extend to said terminal rack, said member adapted to be secured to said enclosing case and to span the opening not engaged by said register mechanism.

Signed by me at Chicago, in the county of Cook and State of Illinois, this 27th day of April, 1923.

HARRY I-I. IDE. 

